yes•ter•dayPronunciation: (yes'tur-dā", -dē), [key]
on the day preceding this day.
a short time ago: Yesterday your money went further.
the day preceding this day.
time in the immediate past.
belonging or pertaining to the day before or to a time in the immediate past: yesterday morning.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.